/*----------------------------------------------------------------------------/
/ TJpgDec - Tiny JPEG Decompressor include file               (C)ChaN, 2019
/----------------------------------------------------------------------------*/
#ifndef DEF_TJPGDEC_HAGL
#define DEF_TJPGDEC_HAGL
/*---------------------------------------------------------------------------*/
/* System Configurations */

#define JD_SZBUF 512 /* Size of stream input buffer */
#define JD_FORMAT \
    1 /* Output pixel format 0:RGB888 (3 BYTE/pix), 1:RGB565 (1 WORD/pix) */
#define JD_USE_SCALE 1 /* Use descaling feature for output */
#define JD_TBLCLIP \
    1 /* Use table for saturation (might be a bit faster but increases 1K bytes \
       of code size) */

/*---------------------------------------------------------------------------*/

#ifdef __cplusplus
extern "C" {
#endif

#if defined(_WIN32) /* Main development platform */
typedef unsigned char uint8_t;
typedef unsigned short uint16_t;
typedef short int16_t;
typedef unsigned long uint32_t;
typedef long int32_t;
#else
#include "stdint.h"
#endif

/* Error code */
typedef enum {
    JDR_OK = 0, /* 0: Succeeded */
    JDR_INTR,   /* 1: Interrupted by output function */
    JDR_INP,    /* 2: Device error or wrong termination of input stream */
    JDR_MEM1,   /* 3: Insufficient memory pool for the image */
    JDR_MEM2,   /* 4: Insufficient stream input buffer */
    JDR_PAR,    /* 5: Parameter error */
    JDR_FMT1,   /* 6: Data format error (may be damaged data) */
    JDR_FMT2,   /* 7: Right format but not supported */
    JDR_FMT3    /* 8: Not supported JPEG standard */
} JRESULT;

/* Rectangular structure */
typedef struct {
    uint16_t left, right, top, bottom;
} JRECT;

/* Decompressor object structure */
typedef struct JDEC JDEC;

struct JDEC {
    uint16_t dctr;           /* Number of bytes available in the input buffer */
    uint8_t* dptr;           /* Current data read ptr */
    uint8_t* inbuf;          /* Bit stream input buffer */
    uint8_t dmsk;            /* Current bit in the current read byte */
    uint8_t scale;           /* Output scaling ratio */
    uint8_t msx, msy;        /* MCU size in unit of block (width, height) */
    uint8_t qtid[3];         /* Quantization table ID of each component */
    int16_t dcv[3];          /* Previous DC element of each component */
    uint16_t nrst;           /* Restart inverval */
    uint16_t width, height;  /* Size of the input image (pixel) */
    uint8_t* huffbits[2][2]; /* Huffman bit distribution tables [id][dcac] */
    uint16_t* huffcode[2][2]; /* Huffman code word tables [id][dcac] */
    uint8_t* huffdata[2][2];  /* Huffman decoded data tables [id][dcac] */
    int32_t* qttbl[4];        /* Dequantizer tables [id] */
    void* workbuf;            /* Working buffer for IDCT and RGB output */
    uint8_t* mcubuf;          /* Working buffer for the MCU */
    void* pool;               /* Pointer to available memory pool */
    uint16_t sz_pool;         /* Size of momory pool (bytes available) */
    uint16_t (*infunc)(JDEC*, uint8_t*,
                       uint16_t); /* Pointer to jpeg stream input function */
    void* device; /* Pointer to I/O device identifiler for the session */
};

/* TJpgDec API functions */
JRESULT jd_prepare(JDEC*, uint16_t (*)(JDEC*, uint8_t*, uint16_t), void*,
                   uint16_t, void*);
JRESULT jd_decomp(JDEC*, uint16_t (*)(JDEC*, void*, JRECT*), uint8_t);

#ifdef __cplusplus
}
#endif

#endif /* _TJPGDEC */
